JPH0652787A - Trip device of protective switching utensil - Google Patents

Abstract

PURPOSE: To improve a trip device using a holding magnet of a protective switching device, in particular of an earth leakage breaker and constitute it more insensitively to a tolerance. CONSTITUTION: A trip device using a holding magnet comprises a movable piece holder 2 guided to a casing 1 and a movable piece 3 held in a state parallel to a magnetic electrode face 4 of the magnet by means of this holder. A trip lever 5 is subject to action of a trip spring 6. The movable piece holder 2 and the trip lever 5 are coupled so that one moves together with the other and so that, after the movable piece holder 2 abuts with a stopper 7, the trip lever 5 further moves rotationally. This rotational movement advances until the trip lever reaches the stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective switchgear equipped with a movable piece holder guided by a casing and a movable piece held by the holder in a state parallel to the magnetic pole surface of a magnet, and more particularly to an earth leakage. The present invention relates to a trip device using a holding magnet for a circuit breaker.

[0002]

2. Description of the Related Art Since such a structure does not operate with a rotating magnet piece, its operating characteristics are particularly excellent. On the other hand, this structure contains considerable mechanical or structural insufficiency due to holding the movable piece parallel to the pole faces. For example, operating air gap tolerances act and thus also affect trip operating characteristics. Even in a magnet provided with a hinge-shaped movable piece having a rotation fulcrum on the side, it is customary to actually adjust the trip stroke during and after manufacture.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a trip device using a holding magnet having a movable piece holder and a movable piece held by the holder in a state parallel to the magnetic pole surface of the magnet. Is further improved,
To be less sensitive to tolerances.

[0004]

DISCLOSURE OF THE INVENTION The above-mentioned problem is a protective opening / closing device having a movable piece holder guided by a casing and a movable piece held by the holder in a state parallel to the magnetic pole surface of the magnet. , Especially in a trip device using a holding magnet of an earth leakage breaker, the movable piece holder is coupled with the trip lever so as to move along with the rotation of the trip lever which is acted by a trip spring, and the trip lever is movable. This is solved by arranging the holder so that it can be further rotated after hitting the stopper.

[0005]

[Advantageous Effects] The trip lever is rotated after the movable piece holder hits the stopper in some cases until the trip lever reaches the stopper. A trip device using such a holding magnet may have a small operating gap, that is, a distance between the movable piece and the magnetic pole surface of the magnet. This distance can be limited to a predetermined value by uniquely mounting the movable piece holder, and the economically unavoidable tolerance is set within the range of rotation of the trip lever after the movable piece holder hits the stopper. Therefore, the extent of this rotation is related to the tolerance, but no longer to the working air gap.

It is preferable to prepare an inner or outer surface of the casing as a stopper of the movable piece holder. This is because these parts can be adjusted easily and satisfactorily with a small tolerance.

According to the principle of the present invention, the sliding surface is in contact with the movable piece holder even after the movable piece holder hits the stopper so that the ridge line can be further rotated while sliding along the sliding surface. On the other hand, it is easily realized by causing the movement of the movable piece holder with the rotation of the trip lever until the movable piece holder hits the stopper. For this purpose, a projection is formed on the trip lever or the movable piece holder, and the projection first comes into contact with the plate-like portion on the side of the movable piece holder or the trip lever. When the movable piece holder hits the stopper in the course of its movement, the trip lever rotates while sliding at a constant interval along the sliding surface with respect to the rotation fulcrum of the trip lever. In this range, the combination of the rotation of the trip lever and the movement of the movable piece holder is released, but the movable piece holder does not return. The trip lever has one point of action for the trip spring formed on one arm with respect to the rotation fulcrum of the trip lever, that is, the trip spring is formed on the arm moving away from the rotation fulcrum in the direction of increasing the lever arm over the opening direction. Since the other point of action of the trip spring is fixed to the casing, the torque on the trip lever can be kept substantially constant regardless of the degree of tension or slack of the spring. Such a structure is known per se (see, for example, German Patent DE 2059052).

The structure of the trip device using the holding magnet is simpler by forming the movable piece holder basically in the shape of a pole and forming a mounting foot for suspending the movable piece with a clip in the movable piece holder. become. The clip may have play in the movable piece due to its shape and / or optionally its size. It is also known to suspend the movable piece with play in this way (see, for example, German Patent Publication No. 3332860).

Since the casing mounts the block-shaped magnet, by providing the guide means which engages with the guide means on the magnet block side, the manufacture thereof is simplified and the accurate trip operation characteristic is promoted. .
In order to position the magnet block in a predetermined state in the casing, it is preferable that the fitting of the magnet block along the guide means is restricted by the positioning means.

In order to ensure the operation accuracy and long-term stable operation of the trip device, the casing is sealed in a dustproof structure.
Therefore, it is effective to seal the through hole for the connecting conductor of the trip coil of the magnet block with the packing material to the connecting conductor or the casing. Furthermore, by configuring the connecting conductor as a pin, its manufacture, in particular its automation, is facilitated. The connecting conductor is embedded in the insulation for the bobbin of the trip coil and can carry the packing. The packing portion is formed by forming the packing material into an appropriate shape. The trip coil is configured to fit into one leg of a permanent magnet located between the two legs to further facilitate automation of manufacturing.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments schematically shown in the drawings.

The trip device using a holding magnet shown in the embodiment of FIG. 1 includes a movable piece holder 2 guided by a casing 1. This movable piece holder holds the movable piece 3 and guides it in parallel with the magnetic pole surface 4 of the magnet. The trip device further comprises a trip lever 5 on which a trip spring 6 acts. The movable piece holder 2 and the trip lever 5 are connected to each other so that when one moves, the other also moves. The trip lever 5 can be further rotated, for example, from the position shown in FIG. 2 to the position shown in FIG. 3 after the movable piece holder 2 hits its stopper 7 as shown in FIGS. 2 and 3, for example. Although the operating gap between the magnetic pole surface 4 of the magnet and the movable piece 3 is kept small, the trip lever 5 is shown in FIG.
To a position shown in FIG. 3 over a large angular range. The trip lever 5 therefore works in conjunction with the relatively sturdy unlocking device of the locking device to balance the tolerances. When the trip device is used for an earth leakage breaker, the movable piece 3 is separated from the magnetic pole surface 4 of the magnet when a fault current is generated, and when the earth leakage breaker is turned on again, the movable piece 3 comes into contact with the magnetic pole surface 4 of the magnet again. In this case, since the operating gap between the magnetic pole surface 4 of the magnet and the movable piece 3 is small, the kinetic energy is also small, and therefore the contact surface between the magnetic pole surface 4 of the magnet and the movable piece 3 is less likely to be damaged. ,
Therefore, the operating characteristics of the trip device are also maintained well over long periods of use.

The inner or outer surface of the casing is effectively used as the stopper 7 of the movable piece holder 2. In this embodiment, the stopper 7 is formed on the guide portion of the movable piece holder 2.

The trip lever 5 of this embodiment has a sliding surface 8 after the movable piece holder 2 hits its stopper 7.
Can contact the movable piece holder 2 and rotate further. In this case, the ridge line 9 slides along the sliding surface 8, but the trip lever 5 and the movable piece holder 2 move in association with each other until the movable piece holder 2 hits the stopper 7. The range of this movement is the range in which the trip lever 5 rotates from the position of FIG. 1 to the position of FIG. 2 or 4. After that, the ridge line 9 of the protrusion of the movable piece holder 2 slides along the sliding surface 8 of the trip lever 5. The sliding surface 8 is theoretically formed concentrically with the rotary shaft 10 of the trip lever 5. In practice even an approximately flat surface is sufficient. In the embodiment of FIGS. 5 to 8, the protrusion is provided not on the movable piece holder side but on the trip lever side.

The trip lever 5 has one action point 11 of the trip spring 6, that is, an arm on the side of the rotation fulcrum 10. Viewed over the opening movement, the trip spring 6 moves away from the rotation fulcrum 10 in the direction of increasing the lever arm, as can be seen by comparing FIGS. 1 and 2 or FIGS. 1 and 3. The line of action 12 of the trip spring 6 then moves away from the shaft or the pivot point 10, which increases the lever arm for the action of the trip spring 6. This causes the force of the trip spring 6 to counteract the reduction as the trip spring contracts. As a result, the throwing power is equalized, so that the mechanism is made lighter and damage to the magnetically effective surfaces of the movable piece 3 and the magnetic pole surface 4 is avoided.

In the different embodiments according to FIGS. 5 to 8, a ridge line 9 effective for turning the trip lever 5 is formed on the trip lever 5 side. The positions of FIGS. 5 to 8 correspond to the positions of FIGS. The mounting of the return spring 13 is further illustrated in the exemplary embodiment according to FIGS. This return spring is omitted in FIG. 8 as is the case with the trip spring.

The movable piece holder 2 according to FIG. 9 corresponds to the one according to FIGS. 1 to 4, and in principle also corresponds to the one according to FIGS. 5 to 8, but it is formed in the shape of a pole and the mounting foot 14 is provided. Is forming. The movable piece 3 is suspended from the stationary foot 14 by a clip 15. By determining the shape and size of the clip 15, the movable piece 3 holds play at its boundary. In this embodiment, the clip is W-shaped. This clip forms a support surface 17 for the movable piece 3 and a play is formed between the movable piece and the guide notch 16. Details of this structure are shown in the exploded view of FIG.

In the embodiment shown in FIG. 11, the casing 1 is provided with a guide means 18 for accommodating a magnet block 19 having a block shape. Magnet block 1
9 is fitted into the casing 1 by the guide means and the guide means 20 (FIG. 12) on the side of the magnet block 19 facing the guide means 9 when mounted on the casing 1. In this case, the position is individually determined by the positioning means 21. These serve as stoppers and regulate the insertion of the magnet block 19 into the casing 1 to a desired position. The guide means 18 of the magnet block 19 is formed to have a slightly protruding shape, and can be a rivet or a welding head for fixing the magnet in the installed state. The magnet block 19 holds a permanent magnet 22 between the two legs forming a magnetic pole surface 4 as a fitting member and of a magnetically conductive material.

The casing 1 preferably has a dustproof structure. In this case, as shown in FIG. 13, the through hole 27 for the connecting conductor 24 of the trip coil 25 of the magnet block 19 is also preferably sealed to the casing 1 by the packing material 26. In this embodiment, the casing 1 is constructed such that the portion of the through hole 27 of the connecting conductor 24 is retracted inward, and these are wound and guided within the range of the outer surface of the casing at a bending radius determined by the material of the connecting conductor 24. Has been done. This results in a space-efficient structure for the necessary connections to the part for the instrument into which the trip device is inserted. When the connecting conductor 14 is formed in a pin shape, a stable effect in manufacturing technology can be obtained. Therefore, a simple structure can be obtained by simultaneously forming the insulating material for the bobbin of the trip coil 25 and the packing material 26 in the shape of the packing portion.

The trip coil 25 is preferably attached to one leg of the magnet block 19. In this case, the permanent magnet 22 is housed between the two legs. The magnet block thus assembled according to FIG. 15 is introduced into the casing as a whole, in which case the connecting conductor 24 is inserted into the through hole 27 of the casing 1 until it is sealed by the packing material 26.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a movable piece is in contact with a magnet, that is, a state where a casing of a trip device using a holding magnet according to an embodiment of the present invention is opened.

FIG. 2 is a view partially showing a state where a movable piece holder hits a stopper in the trip device of FIG.

FIG. 3 is a view showing a state in which the trip lever further moves after the movable piece holder hits the stopper in the trip device of FIG. 1;

FIG. 4 is a diagram showing a relationship between a movable piece holder and a trip lever in the trip device of FIG. 1 in a state shown in FIG.

FIG. 5 is a side view showing a trip device using a holding magnet according to another embodiment of the present invention with a flat casing open.

6 shows the trip device according to FIG. 5 in the open and closed position according to FIG.

7 shows the trip device according to FIG. 5 in the open and closed position according to FIG.

FIG. 8 is a perspective view showing the relationship between the movable piece holder and the trip lever of the trip device shown in FIG. 5 in the open / closed position shown in FIG. 6;

FIG. 9 is a perspective view showing a state where the movable piece holder suspends the movable piece.

FIG. 10 is an exploded perspective view of the movable piece holder according to FIG.

FIG. 11 is a perspective view showing a state of magnets accurately arranged in the casing.

12 is an exploded perspective view of the structure according to FIG.

FIG. 13 is a cross-sectional view of the sealed penetration from the casing of the connecting conductor of the trip coil.

FIG. 14 is a perspective view showing the magnet mounted on the casing with the casing lid removed.

15 is an exploded perspective view showing the structure of FIG.

[Explanation of symbols]

 1 Trip device casing 2 Movable piece holder 3 Movable piece 4 Magnetic pole surface 5 Trip lever 6 Trip spring 7 Stopper 8 Sliding surface 9 Ridge line 10 Trip lever shaft or rotation fulcrum 11 Trip spring side action point 12 Trip spring side Line of action 13 Return spring 14 Installation foot 15 Clip 16 Guide notch 17 Support surface 18 Magnet block guide means 19 Magnet block 20 Opposing guide means on the magnet block side 21 Positioning means 22 Permanent magnet 23 Magnet block leg 24 Trip coil Connecting conductor 25 Trip coil 26 Packing material for through hole of connecting conductor 27 Through hole for connecting conductor

Claims (9)

[Claims] 1. A movable piece holder (2) guided by a casing (1) and a movable piece (3) held by the holder in a state parallel to a magnetic pole surface (4) of a magnet.
And the movable piece holder (2) has a trip spring (6).
The trip lever (5) is coupled to the trip lever (5) so as to move along with the rotation of the trip lever (5), and the movable piece holder (2) of the trip lever (5) hits the stopper (7). A trip device using a holding magnet of a protective opening / closing device, which is further configured to be able to further rotate until reaching a stopper of a trip lever in some cases. 2. Trip device according to claim 1, characterized in that the inner or outer surface of the casing (1) is used as the stopper (7) of the movable piece holder (2). 3. The trip lever (5) has its sliding surface (8) in contact with the movable piece holder (2) after the movable piece holder (2) hits its stopper (7), and especially the ridgeline (9) The movable piece holder (2) can be further rotated while sliding along the sliding surface (8), and the movable piece holder (2) is rotated together with the rotation of the trip lever (5) until the movable piece holder (2) hits the stopper (7). The trip device according to claim 1, wherein the exercise is performed. 4. The trip lever (5) has one point of action (11) of the trip spring (6) at its rotational fulcrum (10).
Side arm, that is, the trip spring (6) is formed on the arm opening in the direction of increasing the lever arm from the rotation fulcrum (10) over the opening direction, and the trip spring (6) is formed.
The trip device according to claim 1, wherein the other point of action of is fixed to the casing. 5. The movable piece holder (2) is basically formed in a pole shape and the movable piece (3) is clipped (1).
5) to form a mounting foot (14) for hanging,
5. Trip device according to one of the claims 1 to 4, characterized in that the mounting foot leaves play due to its shape and / or dimensions. 6. A guide means (18) for engaging a guide means (20) on the side of the magnet block (19) for mounting the magnet block (19) in the casing (1), and the magnet block. Means (2) for positioning the (19) in a predetermined state of the casing (1)
1) The trip device according to any one of claims 1 to 5, further comprising: 7. The casing (1) is a connecting conductor (24) for a trip coil (25) of a magnet block (19).
6. Trip device according to claim 1, characterized in that the through hole (27) for the connection is sealed to the connecting conductor or the casing by a packing material (26). 8. The connecting conductor (24) is configured as a pin,
8. Trip device according to claim 7, characterized in that it is embedded in an insulation for the bobbin of the trip coil (25), which insulation forms a packing packing. 9. The trip coil (25) is a permanent magnet (2) arranged between two legs of a magnet block (19).
8. It is fitted in one leg of 2).
The described trip device.